Dishwasher

Abstract

The present invention comprises a tub comprising a bottom, an upper wall, a one-sided wall, a other-sided wall, and a rear wall, wherein a washing space is formed inside; a door provided at the front of the tub for opening and closing the washing space; and a drying device for drying the washing space, wherein the drying device comprises a drying duct including a condensation duct and a return duct, a fan for circulating internal air, and a heater for heating internal air. The above return duct and condensation duct are in contact with each other vertically at a predetermined point, and a through hole is formed at a predetermined point that communicates with the interior of the return duct and condensation duct. Accordingly, drying performance is improved, and the growth of bacteria or mold can be inhibited by installing a heat conductor in the through hole.

Description

Technology Field

[0001] The present invention relates to a dishwasher, and more specifically, to a dishwasher that improves drying performance and reduces or eliminates bacteria or mold by lowering the humidity inside the duct. Background Technology

[0002] A dishwasher is a home appliance that removes foreign substances remaining on objects to be cleaned, such as dishes or cooking utensils, by spraying a cleaning solution onto them.

[0003] Such dishwashers generally include a tub that provides a washing space, a rack provided within the tub for accommodating dishes, a spray arm that sprays washing liquid onto the rack, a sump that stores washing liquid, and a washing pump that supplies washing liquid stored in the sump to the spray arm.

[0004] In addition, the dishwasher may be equipped with a drying module. The drying module can remove moisture remaining on dishes (to be dried) by supplying heated air into the interior of the tub (washing chamber, drying chamber).

[0005] Drying modules can be classified into open circulation type and closed circulation type. An open circulation type drying module can discharge humid air inside the tub to the outside of the tub and heat outside air to supply it to the inside of the tub. On the other hand, a closed circulation type drying module can discharge humid air inside the tub to the outside of the tub, remove moisture from the discharged air, and then supply the moisture-removed air back into the tub.

[0006] Although closed-circulation type drying modules may offer better drying performance than open-circulation type drying modules, they can increase manufacturing costs and require more installation space, which can be an obstacle to miniaturizing dishwashers.

[0007] The drying module may include a duct, a fan that circulates air inside the duct, and a heater that heats the air inside the duct.

[0008] The duct may be longer in a closed-circulation type drying module than in an open-circulation type drying module. Additionally, the duct may be formed in a curved shape to improve drying performance or when the installation location or space of the drying module is constrained.

[0009] If the duct is extended or formed in a curved shape, heat from the heater is not transferred effectively, and the duct may have sections with a small slope or flat sections. In these sections, humidity increases due to water flowing into or condensing inside the drying module, which can lead to the proliferation of bacteria or mold and the generation of unpleasant odors.

[0010] In particular, a water retention space may be formed in the duct to collect water flowing inside and discharge it to the outside. However, if this water retention space is formed in a section of the duct where the heater's heat is not effectively transferred, the humidity around the space may increase, leading to the proliferation of bacteria or mold and the generation of foul odors. A drain may be formed at the bottom of the water retention space.

[0011] Therefore, humidity must be lowered in duct sections with a small slope or flat surfaces, or around areas where water accumulates, where the heater's heat is not transferred effectively.

[0012] Meanwhile, to improve drying performance, drains are formed in the duct to remove water from inside the duct. As the structure of the duct becomes more complex, water accumulates at various points inside the duct, so drains must be formed at multiple points. In other words, the number of drains increases.

[0013] Since it is desirable to install an opening and closing device for each drain, increasing the number of drains may make the drying module more complex and increase manufacturing costs.

[0014] Accordingly, even if the number of drains increases due to the complexity of the duct structure, a method is required to simplify the drying module and lower manufacturing costs by reducing the number of opening and closing devices.

[0015] The prior art related to drying modules is as follows.

[0016] European Patent No. 2757930 relates to a dishwasher having a drying system, which discharges air inside the tub to the outside of the tub through a condensation assembly and supplies air outside the tub to the inside of the tub through an assembly for blowing and heating drying air.

[0017] In the above prior art, a 'V'-shaped duct is disclosed to prevent water from coming into contact with the motor of the dry air flow and heating assembly, a heater is placed in the 'V'-shaped duct, and a water accumulation space is formed in the elbow portion of the 'V'-shaped duct.

[0018] However, in the aforementioned prior art, since the length of the duct is relatively short and the water accumulation space is formed in a straight line with the heater, the heat from the heater can be effectively transferred to the water accumulation space. Accordingly, the aforementioned prior art does not disclose a method for lowering humidity in duct sections or around the water accumulation space where the heat from the heater is not effectively transferred.

[0019] Furthermore, the above prior art does not disclose a method for simplifying a drying module in relation to a plurality of drains or opening / closing devices. Prior art literature

[0020] European Patent No. 2757930 The problem to be solved

[0021] The objective of the present invention is to provide a dishwasher with improved drying performance.

[0022] In addition, the objective of the present invention is to provide a dishwasher with a simple configuration and reduced manufacturing, installation, and maintenance costs.

[0023] In addition, the objective of the present invention is to provide a dishwasher that reduces or eliminates bacteria or mold and removes odors by lowering the humidity inside the duct.

[0024] In addition, the objective of the present invention is to provide a dishwasher that reduces manufacturing / management costs and energy consumption, effectively reduces or removes bacteria or mold, and effectively removes odors.

[0025] In addition, the objective of the present invention is to provide a dishwasher in which a heat conductor (160) easily supplies heat to the interior of a second condensation duct (1124) at low cost with a simple configuration.

[0026] In addition, the objective of the present invention is to provide a dishwasher in which heat loss is reduced and heat transfer efficiency is improved.

[0027] In addition, the objective of the present invention is to provide a dishwasher that prevents an increase in air flow resistance by a heat conductor (160).

[0028] In addition, the objective of the present invention is to provide a dishwasher with improved energy efficiency or drying efficiency.

[0029] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0030] To solve the above-mentioned problem, the present invention provides a dishwasher comprising: a tub (12) configured to include a bottom (12B), an upper wall (12T), a side wall (12R), a side wall (12L), and a rear wall (12RR), and having a washing space (12S) formed inside; a door (14) provided at the front of the tub (12) and opening and closing the washing space (12S); and a drying device (100) for drying the washing space.

[0031] The drying device comprises: a drying duct (110) that is connected to the inlet (H1) and outlet (H2), is positioned on the outside of the tub (12), and includes a condensation duct (112) and a return duct (114); a fan (130) for circulating air inside the drying duct (110); and a heater (140) located inside the drying duct (110) for heating the air.

[0032] The above condensation duct (112) is configured to include: a first condensation duct (1122) facing the outer surface of the one side wall (12R) and having an upstream end communicating with the inlet (H1); and a second condensation duct (1124) disposed at the bottom of the bottom (12B) and having an upstream end communicating with the downstream end of the first condensation duct (1122).

[0033] The above return duct (114) is located between the bottom (12B) of the tub (12) and the second condensation duct (1124), and its upstream end is connected to the downstream end of the second condensation duct (1124) and its downstream end is connected to the outlet (H2).

[0034] The above return duct (114) and the second condensation duct (1124) are in contact with each other vertically at a predetermined point between the upstream and downstream ends of the return duct (114) and the second condensation duct (1124).

[0035] At the aforementioned predetermined point, a through hole (TH, D3) is formed that communicates with the interior of the return duct (114) and the second condensation duct (1124).

[0036] In one embodiment, a single partition wall (W) is disposed at the predetermined point to partition the return duct (114) and the second condensation duct (1124), and the through hole (TH, D3) is formed in the partition wall (W).

[0037] In one embodiment, the heater (140) is placed inside the return duct (114).

[0038] In one embodiment, the drying device (100) includes a heat conductor (160) that is positioned through the through hole (TH, D3) and connected to the heater (140) to receive heat from the heater (140).

[0039] In one embodiment, the heat conductor (160) is located near a water accumulation space (P) formed inside the second condensation duct (1124).

[0040] In one embodiment, the second condensation duct (1124) is configured to include a downstream duct (1124B) that is in communication with the upstream end (114U) of the return duct (114) and is formed to be approximately parallel to the horizontal plane or inclined upward along the direction of air flow.

[0041] The heat conductor (160) is positioned near the upstream end of the downstream duct (1124B).

[0042] In one embodiment, the height of the lower surface of the downstream duct (1124B) gradually increases from near the upstream end of the downstream duct (1124B) to near the downstream end.

[0043] In one embodiment, the heat conductor (160) is configured to include a plurality of heat-conducting members (162) spaced apart from each other.

[0044] In one embodiment, the through hole (TH, D3) has a cross-sectional area of ​​the same size as the portion of the heat conductor (160) that passes through the through hole (TH, D3). Effects of the invention

[0045] According to embodiments of the present invention, the return duct (114) and the second condensation duct (1124) are in contact with each other vertically at a predetermined point between the upstream and downstream ends of the return duct (114) and the second condensation duct (1124), and a through hole (TH, D3) communicating with the interior of the return duct (114) and the second condensation duct (1124) may be formed at the predetermined point. Accordingly, the through hole (TH, D3) can function as a drain (D3) for discharging water from the return duct (114). At this time, even if the through hole (TH, D3) is always open, dry or warm air is not lost to the outside and there is no pressure loss to the outside, so there is no need to install a separate configuration for opening and closing the through hole (TH, D3). Accordingly, the configuration of the drying device (100) is simplified, and manufacturing, installation, and maintenance costs can be reduced. In addition, since water does not accumulate on the lower surface of the return duct (114) when the through hole (TH, D3) is always open, even if the heater (140) is placed inside the return duct (114), it is possible to prevent a large amount of water from vaporizing into steam by the heater (140) and increasing the humidity of the air. Accordingly, drying performance can be improved. In addition, the heat conductor (160) can be installed simply and easily through the through hole (TH, D3).

[0046] According to embodiments of the present invention, a single partition wall (W) is disposed at a predetermined point to partition the return duct (114) and the second condensation duct (1124), and a through hole (TH, D3) can be formed in the partition wall (W). Accordingly, the return duct (114) and the second condensation duct (1124) can be easily manufactured at low cost with a simple configuration. Additionally, a through hole (TH, D3) communicating with the interior of the return duct (114) and the second condensation duct (1124) can be formed simply and easily.

[0047] Additionally, since the return duct (114) and the second condensation duct (1124) are partitioned by a single dividing wall (W), some of the heat generated by the heater (140) placed inside the return duct (114) can be easily transferred to the second condensation duct (1124). Accordingly, the small amount of water inside the second condensation duct (1124) vaporizes due to the heat transferred to the second condensation duct (1124), thereby lowering the humidity of the second condensation duct (1124) and preventing the proliferation of bacteria or mold inside the second condensation duct (1124).

[0048] Additionally, the separating wall (W) can prevent the heat from the heater (140) placed inside the return duct (114) from being transferred directly to the water collected on the lower surface of the second condensation duct (1124). Therefore, it is possible to prevent the large amount of water collected on the lower surface of the second condensation duct (1124) from vaporizing into water vapor by the heater (140) and increasing the humidity of the air. Accordingly, drying performance can be improved.

[0049] According to embodiments of the present invention, a heater (140) may be placed inside a return duct (114). Accordingly, since air can be effectively heated without heat loss inside the return duct (114) near the outlet (H2), the heated air discharged into the washing space (12S) can effectively remove moisture remaining on dishes, etc. inside the washing space (12S). Accordingly, drying performance can be improved at low cost with a simple configuration.

[0050] In addition, since the heater (140) is positioned far away from the condensation duct (112) so as not to come into contact with the water condensed in the condensation duct (112), the heat generated by the heater (140) can be prevented from vaporizing the large amount of water collected in the condensation duct (112). Accordingly, the air inside the return duct (114) can be discharged into the washing space (12S) in a high-temperature, dry state, thereby improving drying performance.

[0051] In addition, a heat conductor (160) placed through the through hole (TH, D3) can be easily connected to the heater (140) to transfer heat to the condensation duct (112).

[0052] According to embodiments of the present invention, the drying device (100) may include a heat conductor (160) that is positioned through a through hole (TH, D3) and connected to a heater (140) to receive heat from the heater (140). Accordingly, the heat conductor (160) can easily supply heat to the interior of the second condensation duct (1124) at low cost with a simple configuration. In addition, since the heat conductor (160) is installed through the through hole (TH, D3), the heat conductor (160) can be easily installed. In addition, since the heat conductor (160) is positioned through the through hole (TH, D3), the heat conductor (160) is not exposed outside the duct (1124, 114), and the length of the heat conductor (160) can be minimized, thereby reducing heat loss and improving heat transfer efficiency.

[0053] In addition, the drying duct (110) has a bent shape to improve drying performance or to manufacture a small and compact structure, and thus, even if the heat from the heater (140) placed inside the return duct (114) is not well transferred to the inside of the second condensation duct (1124), the heat conductor (160) can supply heat to the inside of the second condensation duct (1124). Therefore, the heat conductor (160) can lower the humidity inside the second condensation duct (1124) to prevent the proliferation of bacteria or mold, or to remove bacteria or mold and to remove odors.

[0054] According to embodiments of the present invention, a heat conductor (160) may be placed near a water accumulation space (P) formed inside the second condensation duct (1124). Accordingly, heat is supplied near the water accumulation space (P) with high humidity within the second condensation duct (1124), thereby effectively lowering the humidity. Consequently, the number or size of the heat conductors (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Thus, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or effectively removed. Additionally, odors can be effectively removed.

[0055] According to embodiments of the present invention, a heat conductor (160) may be positioned near the upstream end (1124BU) of the second downstream duct (1124B). Accordingly, heat supplied from the heat conductor (160) is transferred (convected) throughout the second downstream duct (1124B) by air flowing from the upstream end (1124BU) to the downstream end (1124BD) of the second downstream duct (1124B), thereby effectively lowering the humidity of the second condensation duct (1124). Accordingly, the number or size of the heat conductors (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Thus, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or effectively removed. In addition, odors can be effectively removed.

[0056] In particular, the slope of the second downstream duct (1124B) may be smaller than the slope of the second upstream duct (1124A) or the first condensation duct (1122), and since the second downstream duct (1124B) may be located at the lowest height, the most water may accumulate in the second downstream duct (1124B) and the humidity may be the highest. Accordingly, if a heat conductor (160) is placed near the upstream end (1124BU) of the second downstream duct (1124B) to lower the humidity of the entire second downstream duct (1124B), bacteria or mold in the drying duct (110) can be effectively reduced or removed.

[0057] According to embodiments of the present invention, the lower surface of the second downstream duct (1124B) can be formed such that its height gradually increases from near the upstream end (1124BU) of the second downstream duct (1124B) to near the downstream end (1124BD). Accordingly, a water accumulation space (P) can be formed near the upstream end (1124BU) of the second downstream duct (1124B). Therefore, when a heat conductor (160) is placed near the upstream end (1124BU) of the second downstream duct (1124B), heat is supplied near the high-humidity water accumulation space (P), and the heat supplied from the heat conductor (160) is transferred (convected) throughout the second downstream duct (1124B) by the air flowing from the upstream end (1124BU) to the downstream end (1124BD) of the second downstream duct (1124B), thereby allowing the humidity of the second condensation duct (1124) to be lowered more effectively. Accordingly, the number or size of the heat conductors (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Thus, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or effectively removed. In addition, odors can be effectively removed.

[0058] According to embodiments of the present invention, the heat conductor (160) may be configured to include a plurality of heat-conducting members (162) spaced apart from each other. Accordingly, the surface area of ​​the heat conductor (160) is increased so that heat can be effectively transferred into the interior of the second condensation duct (1124), and air can flow through the space between the heat-conducting members (162), thereby preventing an increase in air flow resistance caused by the heat conductor (160).

[0059] According to embodiments of the present invention, the through hole (TH, D3) may have a cross-sectional area of ​​the same size as the portion of the heat conductor (160) that passes through the through hole (TH, D3). Accordingly, since the through hole (TH) is blocked by the heat conductor (160), the backflow or circulation of air flowing from the second condensation duct (1124) into the return duct (114) back into the second condensation duct (1124) through the through hole (TH) can be prevented, and the turbulence caused by this can also be prevented. Therefore, energy efficiency or drying efficiency can be improved.

[0060] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0061] FIG. 1 is a cross-sectional view of a dishwasher according to one embodiment of the present invention. FIG. 2 is a perspective view of a tub according to one embodiment of the present invention, FIG. 3 to 6 are a perspective view, front view, side view, and top view of a drying device and a tub according to one embodiment of the present invention, and FIG. 7 is a perspective view of a drying device according to one embodiment of the present invention. FIG. 8 is a drawing showing a structure in which some components of the drying device of FIG. 3 to 7 are manufactured as a single unit, and FIG. 9 is a perspective view showing a heat exchange duct and a heat exchange flow path section disposed between the first upstream duct and the first downstream duct in the structure of FIG. 8. FIG. 10 is a perspective view showing a second connecting duct, a second condensation duct, a return duct, a fan housing, a heater, a distributor, and a heat conductor according to one embodiment of the present invention, and FIG. 11 to 13 are a perspective view, a plan view, and a cross-sectional view showing a second downstream duct, a return duct, a fan housing, a heater, and a heat conductor according to one embodiment of the present invention. FIG. 14 is an exploded perspective view showing a second downstream duct, a return duct, a fan housing, a heater, a distributor, and a heat conductor according to one embodiment of the present invention. FIG. 15 is a cross-sectional view showing the state in which fan blades and a motor are installed in the fan housing of FIG. 13. FIG. 16 is a cross-sectional view showing a second downstream duct, a return duct, a fan housing, a heater, and a heat conductor according to another embodiment of the present invention. Specific details for implementing the invention

[0062] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0063] The present invention is not limited to the embodiments disclosed below, but can be modified and implemented in various different forms. The embodiments provided are merely intended to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Accordingly, the present invention should be understood not to be limited to the embodiments disclosed below, but to include all modifications, equivalents, and substitutions that fall within the technical spirit and scope of the present invention, as well as substituting or adding the configuration of one embodiment with the configuration of another embodiment.

[0064] The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; rather, it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the invention. In the drawings, components may be depicted as being exaggeratedly large or small in size or thickness for the sake of convenience of understanding, but the scope of protection of the invention should not be interpreted restrictively as a result thereof.

[0065] The terms used in this specification are used merely to describe specific embodiments or examples and are not intended to limit the invention. Furthermore, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "includes" or "consists of" in this specification are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this specification. That is, terms such as "includes" or "consists of" in this specification should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Additionally, terms such as "includes" or "consists of" in this specification should not be interpreted as requiring that all of the features, numbers, steps, actions, components, parts, or combinations thereof described in this specification be included.

[0066] Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. Unless specifically stated otherwise, the first component may be the second component.

[0067] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0068] When it is stated that one component is "above" or "below" another component, it should be understood that it is not only placed directly above the other component, but that another component may also exist in between.

[0069] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0070] For the sake of convenience of explanation, the direction facing the front or rear of the door when the dishwasher door is closed is referred to as the first direction or the front-back direction.

[0071] The second direction or left and right direction refers to the direction facing the left and right sides of the drawing on a drawing facing the front of a closed door.

[0072] The downstream duct described in the claim refers to the second downstream duct (1124B) to be described later.

[0073] Hereinafter, a dishwasher according to some embodiments of the present invention will be described.

[0074] FIG. 1 is a cross-sectional view of a dishwasher according to one embodiment of the present invention.

[0075] Referring to FIG. 1, a dishwasher (1) according to one embodiment may include a cabinet (11), a tub (12), a plurality of spray arms (23, 24, 25), a sump (50), a filter (70), a wash pump (80), a switching valve (85), a water supply valve (32), a drain pump (35), a drying device (100), and a control unit (200). Each component is examined.

[0076] The cabinet (11) can form the exterior of the dishwasher (1).

[0077] The tub (12) may be provided inside the cabinet (11). The tub (12) may be formed in the shape of a cuboid with an open front. However, the shape of the tub (12) is not limited to this and may have various shapes.

[0078] A cleaning space (12S) for accommodating a cleaning object may be formed inside the tub (12). A door (14, FIG. 2) for opening and closing the cleaning space (12S) may be provided at the front of the tub (12).

[0079] An inlet (H1) and an outlet (H2) communicating with a drying device (100) may be formed in the side wall (12R) and bottom (12B) of the tub (12). This will be described later. Additionally, a communication hole (H3) through which a cleaning liquid flows into the sump (50) may be formed in the bottom (12B) of the tub (12).

[0080] A door (14, FIG. 2) is provided on the front of the tub (12) to open and close the washing space (12S).

[0081] A plurality of racks (26, 27) for storing items to be washed, such as dishes, may be arranged in the washing space (12S). The plurality of racks (26, 27) may include a lower rack (26) placed at the bottom of the washing space (12S) and an upper rack (27) placed at the top of the washing space (12S). The lower rack (26) and the upper rack (27) may be spaced apart vertically and may be slid out toward the front of the tub (12).

[0082] A plurality of spray arms (23, 24, 25) may be spaced apart vertically. The plurality of spray arms (23, 24, 25) may include a low spray arm (23), an upper spray arm (24), and a top spray arm (25). The low spray arm (23) may spray cleaning liquid upward toward the lower rack (26). The upper spray arm (24) may be positioned above the low spray arm (23) and may spray cleaning liquid upward toward the upper rack (27). The top spray arm (25) may be positioned at the top of the cleaning space (12S) and may spray cleaning liquid downward.

[0083] Multiple spray arms (23, 24, 25) can receive cleaning fluid from a cleaning pump (80) through multiple spray arm connecting channels (28, 29, 31).

[0084] A sump (50) can be formed at the bottom (12B) of a tub (12) and can collect and store cleaning fluid. Specifically, the sump (50) can be connected to a water supply channel (33) and can receive and store clean cleaning fluid free of foreign matter through the water supply channel (33). Additionally, the sump (50) can receive and store cleaning fluid from which foreign matter has been filtered through a filter (70).

[0085] The filter (70) can be provided in the sump (50) and installed in the connecting hole (H3). The filter (70) can filter foreign matter from the cleaning solution containing foreign matter that moves from the tub (12) to the sump (50).

[0086] The water supply valve (32) can control the cleaning solution supplied from an external water source through the water supply path (33). When the water supply valve (32) is opened, the cleaning solution supplied from the external water source can flow into the sump (50) through the water supply path (33).

[0087] The drainage channel (34) can be connected to a drainage pump (35) and a sump (50).

[0088] The drainage pump (35) can be connected to the drainage path (34) and may be configured to include a drainage motor (not shown).

[0089] When the drainage pump (35) is operated, foreign matter or cleaning liquid filtered through the filter (50) can be discharged to the outside through the drainage path (34).

[0090] The cleaning pump (80) can be positioned at the bottom (12B) of the tub (12) and can supply cleaning fluid stored in the sump (50) to a plurality of spray arms (23, 24, 25).

[0091] The switching valve (85) can optionally connect at least one of the plurality of injection arms (23, 24, 25) to the washing pump (80).

[0092] The drying device (100) may be positioned at the bottom of one side wall (12R) and the bottom (12B) of the tub (12). The drying device (100) may be connected to the inside of the washing space (12S) through an inlet (H1) and an outlet (H2). The drying device (100) may dry the washing space (12S) inside the tub (12).

[0093] In the drying stage of the dishwasher (1), humid air inside the washing space (12S) can be introduced into the drying device (100) through the inlet (H1), and air dried in the drying device (100) can be discharged into the washing space (12S) through the outlet (H2). This circulation of air can be performed repeatedly. In this way, the drying device (100) can improve drying performance through closed circulation of air.

[0094] Meanwhile, various components constituting the dishwasher (1), such as a washing pump (80), are installed at the bottom (12B) of the tub (12), and a sump (50) is formed, so the space for installing the drying device (100) may be narrow. Therefore, the drying device (100) must have a small size and a compact structure so that it can be installed in the dishwasher (1).

[0095] The distributor (150) of the drying device (100) can be inserted into the interior of the washing space (12S) through the outlet (H2). The distributor (150) can be placed at the edge corner of the tub (12) so as not to collide with the rotating spray arm (23).

[0096] The control unit (500) can be connected to and can control the washing pump (80), switching valve (85), water supply valve (32), drainage pump (35) or drying device (100), etc.

[0097] FIG. 2 is a perspective view of a tub according to one embodiment of the present invention, FIG. 3 to 6 are a perspective view, front view, side view, and top view of a drying device and a tub according to one embodiment of the present invention, and FIG. 7 is a perspective view of a drying device according to one embodiment of the present invention.

[0098] Referring to FIG. 2, a tub (12) according to one embodiment may be configured to include a bottom (12B), an upper wall (12T), a side wall (12R), a side wall (12L), and a rear wall (12RR). A cleaning space (12S) may be formed inside the tub (12) by the bottom (12B), the upper wall (12T), the side wall (12R), the side wall (12L), and the rear wall (12RR). For example, the side wall (12R) may be the right wall of the tub (12), and the side wall (12L) may be the left wall of the tub (12).

[0099] A door (14) for opening and closing a washing space (12S) may be provided at the front of the tub (12).

[0100] The floor (12B) and the upper wall (12T) may face each other in the vertical direction, the rear wall (12RR) and the door (14) may face each other in the first direction, and the side wall (12R) and the other side wall (12L) may face each other in the second direction.

[0101] An inlet (H1) and an outlet (H2) may be formed in the tub (12). The outlet (H2) may be located below the inlet (H1). Here, "below" may mean a height lower than that of the inlet (H1).

[0102] Accordingly, high-temperature dry air introduced into the washing space (12S) through the outlet (H2) is discharged to the outside of the washing space (12S) through the inlet (H1) located higher than the outlet (H2), so that the dry air (e.g., high-temperature dry air) can be discharged after effectively circulating inside the washing space (12S). Therefore, drying efficiency can be improved.

[0103] An example of the location of the outlet (H2) and the inlet (H1) is as follows.

[0104] One side wall (12R) of the tub (12) may be divided into a rear section (R11, R12, R13), a central section (R21, R22, R23), and a front section (R31, R32, R33) with respect to the first direction or the front-rear direction. The point dividing the rear section and the central section of the one side wall (12R) may be a point approximately 1 / 4 to 1 / 3 of the width of the one side wall (12R) from the rear end of the one side wall (12R) toward the front. The point dividing the front section and the central section of the one side wall (12R) may be a point approximately 1 / 4 to 1 / 3 of the width of the one side wall (12R) from the front end of the one side wall (12R) toward the rear.

[0105] Additionally, the side wall (12R) of the tub (12) may be divided into an upper section (R11, R21, R31), a central section (R12, R22, R32), and a lower section (R13, R23, R33) with respect to the vertical or vertical direction. The point dividing the upper and central sections of the side wall (12R) may be a point approximately 1 / 4 to 1 / 3 of the height of the side wall (12R) downward from the top of the side wall (12R). The point dividing the lower and central sections of the side wall (12R) may be a point approximately 1 / 4 to 1 / 3 of the height of the side wall (12R) upward from the bottom of the side wall (12R).

[0106] Accordingly, one side wall (12R) of the tub (12) can be divided into nine areas with respect to the first direction and the up-and-down direction: rear upper (R11), rear central part (R12), rear lower part (R13), central upper part (R21), central part (R22), central lower part (R23), front upper part (R31), front central part (R32), and front lower part (R33).

[0107] The bottom (12B) of the tub (12) can also be divided into nine areas in the first and second directions, in a manner similar to the side wall (12R), such as the rear side (B11), rear central part (B12), rear other side (B13), central side (B21), central part (B22), central other side (B23), front side (B31), front central part (B32), and front other side (B33).

[0108] An inlet (H1) may be formed at the rear upper portion (R11) of one side wall (12R) of the tub (12) through which air from the washing space (12S) flows into the interior of the drying duct (110). Additionally, an outlet (H2) may be formed at the rear side portion (B11) of the bottom (12B) of the tub (12) through which air from the interior of the drying duct (110) flows out into the washing space (12S).

[0109] Accordingly, since both the outlet (H2) and the inlet (H1) are formed on one side of the rear of the tub (12), the horizontal distance between the outlet (H2) and the inlet (H1) can be reduced. Additionally, since the outlet (H2) is formed on the bottom (12B) and the inlet (H1) is formed on the upper part of the side wall (12R), the vertical distance between the outlet (H2) and the inlet (H1) can be increased.

[0110] Generally, to introduce air into a specific space and to allow the introduced air to circulate effectively within the space, i) the air introduced from the inlet must not flow directly toward the outlet, and ii) the horizontal distance between the air inlet and outlet must be reduced and the vertical distance increased.

[0111] Therefore, since the above ii) is satisfied, the drying efficiency can be improved because the dry air discharged into the washing space (12S) through the outlet (H2) can be effectively circulated to every corner of the washing space (12S) until it enters the drying device (100) through the inlet (H1). Meanwhile, the above i) can be satisfied through the distributor (150).

[0112] Additionally, since both the outlet (H2) and the inlet (H1) are formed at the rear of the tub (12), a drying duct (110) may be placed around the rear of the tub (12), and a cold air supply module (120) may be placed around the front of the tub (12). Since the rear of the tub (12) is generally blocked by a wall and the front of the tub (12) (especially the front lower part of the tub) is open to the front, the temperature of the air around the front of the tub (12) may be lower. Accordingly, the cold air supply module (120) can effectively lower the humidity of the air inside the drying duct (110) with cold air around the front of the tub (12), thereby improving drying performance.

[0113] Additionally, since the outlet (H2) is formed at the rear of the tub (12), the distributor (150) of the drying device (100) can be positioned at the rear of the tub (12). Therefore, when the door (14) at the front of the tub (12) is opened, the distributor (150) of the drying device (100) does not obstruct the view, thus improving aesthetics, and various devices inside the tub (12) can be easily managed without being obstructed by the distributor (150) of the drying device (100).

[0114] However, it is not limited thereto. Accordingly, the location where the outlet (H2) and the inlet (H1) are formed is not limited to a specific area partitioned in the first direction, the second direction, or the up-and-down direction. In addition, it is not limited to the side wall (12R) and the bottom (12B).

[0115] The outlet (H2) may meet a virtual vertical plane (S) that passes through the inlet (H1) and extends in the second direction and the up-and-down direction. For example, the center of the outlet (H2) may meet a virtual vertical plane (S) that passes through the center of the inlet (H1) and extends in the second direction. The meaning of the outlet (H2) meeting the vertical plane (S) is as follows.

[0116] Among the various outlets (H2) formed on the bottom (12B) that are spaced apart from one end of the bottom (12B) by a specific distance to the other side (the other side of the second direction), the outlet (H2) that has a minimum horizontal distance from the inlet (H1) is the outlet (H2) that meets the virtual vertical plane (S).

[0117] When the outlet (H2) meets the vertical surface (S), the horizontal distance between the outlet (H2) formed on the bottom (12B) of the tub (12) and the inlet (H1) formed on one side wall (12R) of the tub (12) is minimized, so that part of the above-mentioned ii) is satisfied, and the dry air discharged into the washing space (12S) through the outlet (H2) can effectively circulate throughout the washing space (12S) until it enters the drying device (100) through the inlet (H1). Therefore, the drying efficiency can be further improved.

[0118] Referring further to FIGS. 3 through 7, a drying device (100) according to one embodiment may be configured to include a drying duct (110), a cold air supply module (120), a fan (130), a heater (140), and a distributor (150). Additionally, the drying device (100) may further include a heat conductor (160, FIG. 10). However, the cold air supply module (120), the distributor (150), or the heat conductor (160) may be omitted from the drying device (100). Each component is examined.

[0119] [Drying Duct]

[0120] The drying duct (110) is connected to the inlet (H1) and outlet (H2), is positioned on the outside of the tub (12), and may be configured to include a condensation duct (112) and a return duct (114).

[0121] Accordingly, as the condensation duct (112) comes into contact with the outside air at a low temperature outside the tub (12), the water vapor contained in the air flowing along the condensation duct (112) condenses into water and is removed. Therefore, drying performance can be improved at a low cost with a simple configuration.

[0122] The condensation duct (112) may be configured to include a first condensation duct (1122) and a second condensation duct (1124).

[0123] [First Condensation Duct]

[0124] The first condensation duct (1122) may be placed on one side wall (12R). Specifically, the first condensation duct (1122) may face or be in contact with the outer surface or outer circumference of the one side wall (12R). The upstream end (1122U) of the first condensation duct (1122) may be in communication with the inlet (H1).

[0125] Accordingly, since the condensation duct (112) comes into contact with the low-temperature air on the outside of one side wall (12R) of the tub (12), the water vapor contained in the air flowing along the condensation duct (112) is condensed into water and removed. Therefore, drying performance can be improved at low cost with a simple configuration.

[0126] Specifically, for example, the first condensation duct (1122) may be configured to include a first upstream duct (1122A), a heat exchange duct (1122B), and a first downstream duct (1122C) in order along the direction of air flow (Figs. 5 and 7). The first upstream duct (1122A), the heat exchange duct (1122B), and the first downstream duct (1122C) may be three duct sections of the first condensation duct (1122).

[0127] The first upstream duct (1122A) can be connected to the inlet (H1) and air can be introduced.

[0128] The heat exchange duct (1122B) can be in contact with the cold air supply module (120).

[0129] The first downstream duct (1122C) can be connected to the second condensation duct (1124) and can discharge air into the second condensation duct (1124).

[0130] A first drain (D1) may be formed in the first downstream duct (1122C). Accordingly, water introduced through the inlet (H1) or water condensed in the heat exchange duct (1122B), etc., can be discharged to the outside through the first drain (D1), thereby improving the drying performance of the drying device (100).

[0131] A suction fan (not shown) may be provided at the upstream end (1122U) of the first condensation duct (1122) or around it. The suction fan may be a centrifugal fan. Accordingly, the drying performance can be improved by facilitating air flow, and the dishwasher (1) can be miniaturized by minimizing the length of the first condensation duct (1122) to the side by providing a centrifugal fan.

[0132] The downstream end (1122D) of the first condensation duct (1122) may be located near the bottom of the rear portion of one side wall (12R) of the tub (12). This will be described later.

[0133] After first examining the cold air supply module (120) associated with the first condensation duct (1122), examine the second condensation duct (1124).

[0134] [Cold Supply Module]

[0135] The cold air supply module (120) may be placed on the outside of the tub (12). At least a portion of the cold air supply module (120) may be in contact with the first condensation duct (1122).

[0136] Specifically, for example, the cold air supply module (120) may be configured to include a first outside air inlet duct (122), a second outside air inlet duct (124), and a heat exchange channel section (126) (Figs. 5 and 7).

[0137] The first outside air inlet duct (122) can be placed at the bottom of the floor (12B), and outside air can be introduced through the upstream end (122U).

[0138] The second outside air inlet duct (124) may face or be in contact with the outer surface of one side wall (12R), and the upstream end (124U) may be connected to the downstream end (122D) of the first outside air inlet duct (122).

[0139] The heat exchange channel (126) can be in contact with the first condensation duct (1122), and the upstream end (126U) can be connected to the downstream end (124D) of the second outside air inlet duct (124).

[0140] Specifically, for example, the heat exchange channel (126) may extend along the outer surface of the first condensation duct (1122). The downstream end (126D) of the heat exchange channel (126) may be positioned approximately parallel to the second direction and the end (1122E) in the width direction (first direction in the drawing) of the first condensation duct (1122) (Figs. 7 and 9). Air may be discharged to the outside through the downstream end (126D) of the heat exchange channel (126).

[0141] Accordingly, the heat exchange channel section (126) can be configured at a low cost with a simple configuration, and the installation space of the heat exchange channel section (126) can be minimized. In addition, since the length of the heat exchange channel section (126) is shortened, the flow resistance is reduced, and the cooling performance can be improved.

[0142] A cooling fan (128) may be provided around the upstream end (122U) of the first outside air inlet duct (122) or inside the first outside air inlet duct (122). The cooling fan (128) may draw in outside air and supply it to the heat exchange channel (126).

[0143] Accordingly, since the cooling fan (128) can be positioned at the bottom of the tub (12), the cooling fan (128) can draw in cold air from the bottom of the tub (12) and supply it to the heat exchange channel (126), thereby improving cooling efficiency. Additionally, since the space at the bottom of the tub (12) is relatively wide, the size of the cooling fan (128) can be increased to improve cooling efficiency.

[0144] Meanwhile, a first connecting duct (123) may be arranged between the first outside air inlet duct (122) and the second outside air inlet duct (124). The first connecting duct (123) may be connected to the downstream end (122D) of the first outside air inlet duct (122) and the upstream end (124U) of the second outside air inlet duct (124) (Fig. 7).

[0145] In this way, the dishwasher may further include a cold air supply module (120) positioned on the outside of the tub (12) and having at least a portion in contact with the first condensation duct (1122). Accordingly, the cold air supply module (120) can effectively remove water vapor contained in the air flowing along the first condensation duct (1122) by condensing it into water. Thus, drying performance can be improved at a low cost with a simple configuration.

[0146] Additionally, the cold air supply module (120) is configured to include a first outside air inlet duct (122) positioned at the bottom of the floor (12B) through which outside air is introduced, a second outside air inlet duct (124) facing or in contact with the outer surface or outer circumference of one side wall (12R), and a heat exchange passage section (126) in contact with the first condensation duct (1122) and communicating with the second outside air inlet duct (124), thereby effectively removing water vapor contained within the air flowing along the first outside air inlet duct (122) by condensing it into water using cold air from the bottom of the tub (12). Thus, drying performance can be improved at a low cost with a simple configuration.

[0147] With regard to the heat exchange channel section (126), let us look further at FIGS. 8 and FIGS. 9.

[0148] FIG. 8 is a drawing showing a structure in which some components of the drying device of FIG. 3 to 7 are manufactured as a single unit, and FIG. 9 is a perspective view showing a heat exchange duct and a heat exchange flow path section disposed between the first upstream duct and the first downstream duct in the structure of FIG. 8.

[0149] Referring to FIG. 8, the first upstream duct (1122A), the first downstream duct (1122C), and the second outside air inlet duct (124) can be formed integrally. An empty space may be formed between the first upstream duct (1122A) and the first downstream duct (1122C). In the empty space between the first upstream duct (1122A) and the first downstream duct (1122C), a heat exchange duct (1122B) and a heat exchange passage section (126), which will be examined in FIG. 9, may be installed.

[0150] In this way, the first upstream duct (1122A), the first downstream duct (1122C), and the second outside air inlet duct (124) are formed as a single unit, thereby reducing the manufacturing cost of the drying device (100) and making installation and maintenance easier.

[0151] Referring to FIG. 9, a heat exchange duct (1122B) and a heat exchange passage section (126) may be installed between the first upstream duct (1122A) and the first downstream duct (1122C) in the structure of FIG. 8.

[0152] The heat exchange duct (1122B) may correspond to a flat tubular shape with both ends open and may be connected vertically to the first upstream duct (1122A) and the first downstream duct (1122C) of FIG. 8.

[0153] The heat exchange channel section (126) may be configured to include a plate (1262) and a partition wall (1264).

[0154] The plates (1262A, 1262B) may be positioned facing at least one of the two sides of the second direction of the heat exchange duct (1122B).

[0155] Multiple partition walls (1264A, 1264B) may be provided and may be arranged parallel to each other between one side or the other side of the second direction of the heat exchange duct (1122B) and the plates (1262A, 1262B).

[0156] The plates (1262A, 1262B) and the plurality of partition walls (1264A, 1264B) may extend along the outer surface of the heat exchange duct (1122B) in the width direction of the heat exchange duct (1122B) (the first direction in the drawing) which intersects the direction of air flow inside the heat exchange duct (1122B).

[0157] If the heat exchange duct (1122B) and heat exchange flow path (126) of FIG. 9 are installed in the empty space between the first upstream duct (1122A) and the first downstream duct (1122C) of the structure of FIG. 8, the downstream end (124U) of the second outside air inlet duct (124) can come into contact with the side end of the plate (1262) and the heat exchange duct (1122B) in the first direction. Accordingly, cold air introduced into the second outside air inlet duct (124) can flow into the empty space between the plate (1262) and the heat exchange duct (1122B). At this time, a plurality of flow paths can be formed by a plurality of partition walls (1264) extending in the width direction (the first direction in the drawing) of the heat exchange duct (1122B) between the plate (1262) and the heat exchange duct (1122B).

[0158] That is, cold air introduced into the second outside air inlet duct (124) can flow along a plurality of flow paths formed by the heat exchange duct (1122B), the plate (1262), and a plurality of partition walls (1264). The direction in which the cold air flows along the plurality of flow paths formed by the heat exchange flow path section (126) can intersect with the direction in which the humid air flows along the heat exchange duct (1122B).

[0159] At this time, as described above, the downstream end (126D) of the heat exchange channel section (126) can be positioned approximately parallel to the end (1122E) in the width direction (first direction in the drawing) of the first condensation duct (1122) in the second direction (Fig. 9).

[0160] In this way, the heat exchange channel section (126) is configured to include a plate (1262) positioned facing at least one of the first and second sides of the second direction of the heat exchange duct (1122B), and a plurality of partition walls (1264) positioned parallel to each other between the first or second side of the second direction of the heat exchange duct (1122B) and the plate (1262), thereby allowing the heat exchange channel section (126) to be configured at a low cost with a simple configuration. Additionally, since cold air flows along the outer surface of the heat exchange duct (1122B), the heat exchange efficiency can be improved. Furthermore, since cold air is separated from one another and flows along a plurality of channels, heat exchange is performed evenly over a wide area, thereby improving the heat exchange efficiency.

[0161] Meanwhile, as shown in FIG. 9, the heat exchange duct (1122B) and the heat exchange flow path (126) are manufactured separately and then installed between the first upstream duct (1122A) and the first downstream duct (1122C) of the structure of FIG. 8, thereby allowing the drying device (100) to be easily manufactured, replaced, and repaired. Accordingly, manufacturing costs can be reduced and maintenance can be made easier.

[0162] [2nd Condensation Duct]

[0163] FIG. 10 is a perspective view showing a second connecting duct, a second condensation duct, a return duct, a fan housing, a heater, a distributor, and a heat conductor according to an embodiment of the present invention, and FIG. 11 to 13 are a perspective view, a plan view, and a cross-sectional view showing a second downstream duct, a return duct, a fan housing, a heater, and a heat conductor according to an embodiment of the present invention. FIG. 14 is an exploded perspective view showing a second downstream duct, a return duct, a fan housing, a heater, a distributor, and a heat conductor according to an embodiment of the present invention. FIG. 15 is a cross-sectional view showing a state in which a fan blade and a motor are installed in the fan housing of FIG. 13.

[0164] Referring further to FIGS. 10 to 15, the second condensation duct (1124) may be positioned at the bottom (12B) of the tub (12). The upstream end (1124U) of the second condensation duct (1124) may be connected to the downstream end (1122D) of the first condensation duct (1122) (Fig. 7).

[0165] Accordingly, since the condensation duct (112) comes into contact with the low-temperature air at the bottom (12B) of the tub (12), the water vapor contained in the air flowing along the condensation duct (112) is condensed into water and removed. Thus, drying performance can be improved at low cost with a simple configuration.

[0166] Specifically, for example, the second condensation duct (1124) may be configured to include a second upstream duct (1124A) and a second downstream duct (1124B) along the direction of air flow (Figs. 7 and 10). The second upstream duct (1124A) and the second downstream duct (1124B) may be two duct sections of the second condensation duct (1124).

[0167] The second upstream duct (1124A) may be connected to the downstream end (1122D) of the first condensation duct (1122). The second upstream duct (1124A) may be formed to be inclined approximately downward along the direction of air flow.

[0168] The second downstream duct (1124B) may be connected to the upstream end (114U) of the return duct (114). The second downstream duct (1124B) may be formed to be approximately parallel to the horizontal plane or inclined upward along the direction of air flow.

[0169] However, it is not limited to this configuration. Accordingly, the second condensation duct (1124) may not include a downwardly inclined section like the second upstream duct (1124A), and may be composed only of a section parallel to the horizontal plane or inclined upward like the second downstream duct (1124B). In such a case, the second downstream duct (1124B) may be the second condensation duct (1124).

[0170] The slope of the second downstream duct (1124B) may be smaller than the slope of the second upstream duct (1124A) or the first condensation duct (1122).

[0171] The lower surface of the second downstream duct (1124B) can gradually increase in height from near the upstream end (1124BU) of the second downstream duct (1124B) to near the downstream end (1124BD).

[0172] Accordingly, water flowing into or generated in the second downstream duct (1124B) flows away from the fan (130) located near the downstream end (1124BD) of the second downstream duct (1124B), thereby preventing water from flowing into the motor (136) of the fan (130). Thus, since the fan (130) can be prevented from failing due to water, the durability and stability of the drying device (100) can be improved.

[0173] Additionally, a water accumulation space (P, FIG. 13) in which water accumulates in the second downstream duct (1124B) may be formed near the upstream end (1124BU) of the second downstream duct (1124B). Here, the water accumulation space (P) may refer to a space where water accumulates, and accordingly, if a heat conductor (160) is placed near the upstream end (1124BU) of the second downstream duct (1124B), the humidity of the second downstream duct (1124B) can be effectively lowered. This will be described later.

[0174] Here, the water accumulation space (P) may refer to a space where water accumulates. As shown in FIG. 13, the water accumulation space (P) may be formed on the lower surface near the upstream end (1124BU) of the second downstream duct (1124B) and on the upper surface thereof. However, even if the water accumulation space (P) is not formed on the lower surface of the second downstream duct (1124B), as described above, the water accumulation space (P) may be formed near the upstream end (1124BU) of the second downstream duct (1124B) because the height near the upstream end (1124BU) of the second downstream duct (1124B) is lower than the height near the downstream end (1124BD).

[0175] The second condensation duct (1124) may be bent near the downstream end (1124D) and extended approximately vertically (e.g., upward). Accordingly, water that flows into the interior of the second condensation duct (1124) or is generated in the second condensation duct (1124) may be prevented from flowing into the interior of the return duct (114).

[0176] However, this configuration is not limited to this. Accordingly, the second condensation duct (1124) may be extended by bending horizontally, for example, near the downstream end (1124D).

[0177] The horizontal straight distance (D1) between the upstream end (1124U) and the downstream end (1124D) of the second condensation duct (1124) may be greater than the horizontal straight distance (D2) between the upstream end (1124U) of the second condensation duct (1124) and the outlet (H2) (Fig. 6). For example, the upstream end (1124U) of the second condensation duct (1124) may be located beyond the midpoint of the second direction of the bottom (12B) of the tub (12) (Fig. 6).

[0178] Accordingly, even when the outlet (H2) is formed near the inlet (H1) in the horizontal direction to improve drying performance, the horizontal length of the return duct (114) communicating with the downstream end (1124D) of the second condensation duct (1124) and the outlet (H2) can be increased, and the distance between the downstream end (1124D) of the second condensation duct (1124) and the upstream end (114U) of the return duct (114) can be increased. Therefore, a heater (350) having a sufficiently large size can be placed inside or outside the return duct (114), and a fan (130) can be provided between the downstream end (1124D) of the second condensation duct (1124) and the upstream end (114U) of the return duct (114). Accordingly, the drying performance of the dishwasher (1) can be improved with a simple configuration, and the dishwasher (1) can have a small size and a compact structure.

[0179] As described above, the downstream end (1122D) of the first condensation duct (1122) is located near the bottom of the rear portion of the side wall (12R), and the upstream end (1124U) of the second condensation duct (1124) can be located near the side end of the rear portion of the bottom (12B) (Figs. 3, 5 and 7). Accordingly, since both the downstream end (1122D) of the first condensation duct (1122) and the upstream end (1124U) of the second condensation duct (1124) are located in the rear portion of the tub (12), such as the inlet (H1) and outlet (H2), the condensation duct (112) can be formed in a shape that is approximately close to a straight line and can be shortened in length. Accordingly, flow resistance is reduced, and drying performance can be improved.

[0180] A second drain (D2, FIG. 13) may be formed in the second condensation duct (1124). Accordingly, water introduced through the inlet (H1) or outlet (H2), or water condensed in the condensation duct (112), can be discharged to the outside through the second drain (D2), thereby improving the drying performance of the drying device (100).

[0181] The second drain (D2) can be formed in the lower part of the aforementioned water accumulation space (P, FIG. 13), where water accumulates in the second downstream duct (1124B).

[0182] The second drain (D2) may be kept open at all times or opened temporarily depending on the situation. If the second drain (D2) is kept open at all times, air inside the drying duct (110) that is drier or warmer than the outside air may be discharged to the outside through the second drain (D2), and pressure loss may occur. Consequently, energy efficiency or drying efficiency may be reduced. Therefore, it may be desirable for the second drain (D2) to be opened temporarily depending on the situation.

[0183] A water level sensor (not shown) may be provided in the second condensation duct (1124). The water level sensor can detect the height of water collected on the lower surface of the second condensation duct (1124) and can transmit information regarding the water height to the control unit (200, FIG. 1).

[0184] Meanwhile, a second connecting duct (1123) may be arranged between the first condensation duct (1122) and the second condensation duct (1124). The second connecting duct (1123) may be connected to the downstream end (1122D) of the first condensation duct (1122) and the upstream end (1124U) of the second condensation duct (1124) (Fig. 7).

[0185] In this way, the condensation duct (112) is configured to include a first condensation duct (1122) facing the outer surface of one side wall (12R) and having its upstream end connected to an inlet (H1); and a second condensation duct (1124) disposed at the bottom (12B) and having its upstream end connected to the downstream end of the first condensation duct (1122). As a result, the condensation duct (112) comes into contact with the low-temperature air on the outer side of one side wall (12R) and the bottom of the bottom (12B) of the tub (12), so that water vapor contained in the air flowing along the condensation duct (112) condenses into water and is removed. Therefore, drying performance can be improved at a low cost with a simple configuration.

[0186] [Return Duct]

[0187] The return duct (114) may be located between the bottom (12B) of the tub (12) and the second condensation duct (1124). For example, at least a portion of the return duct (114) may be located above and below the second condensation duct (1124) below the bottom (12B) of the tub (12). That is, at least a portion of the return duct (114) may be placed above the second condensation duct (1124).

[0188] Accordingly, it is possible to prevent water from flowing into the second condensation duct (1124) through the inlet (H1) or water condensed in the condensation duct (112) from flowing into the return duct (114). Therefore, since it is possible to prevent water from the condensation duct (112) from flowing into the washing space (12S) through the outlet (H2) communicating with the return duct (114), drying performance can be improved. In other words, drying performance can be improved by preventing water from flowing back.

[0189] Additionally, the upstream end (114U) of the return duct (114) can be connected to the downstream end (1124D) of the second condensation duct (1124), and the downstream end (114D) can be connected to the outlet (H2).

[0190] For example, the downstream end (114D) of the return duct (114) can be connected to a distributor (150) that is inserted into the interior of the washing space (12S) through the outlet (H2) and discharges air into the washing space (12S).

[0191] The second condensation duct (1124) and the return duct (114) may be located only at the lower part (B11, B12, B13) of the bottom (12B) of the tub (12). Accordingly, since the second condensation duct (1124) and the return duct (114) are located at the rear part of the tub (12) along with the outlet (H2) and the inlet (H1), the second condensation duct (1124) and the return duct (114) can be formed in a shape that is approximately close to a straight line, and the length of the duct (1124, 114) can be reduced. Accordingly, the flow resistance is reduced, and drying performance can be improved. In addition, the dishwasher (1) can have a small size and a compact structure.

[0192] The return duct (114) and the second condensation duct (1124) can come into contact with each other vertically at a predetermined point between the upstream and downstream ends of the return duct (114) and the second condensation duct (1124).

[0193] Specifically, for example, the return duct (114) and the second condensation duct (1124) may be in contact with each other vertically along the longitudinal direction of the return duct (114) and the second condensation duct (1124) at least in a portion.

[0194] A single partition wall (W) separating the return duct (114) and the second condensation duct (1124) may be disposed at a predetermined point or part where the return duct (114) and the second condensation duct (1124) come into contact with each other.

[0195] Specifically, for example, the return duct (114) and the second condensation duct (1124) can be separated by a dividing wall (W) arranged along the longitudinal direction of the return duct (114) and the second condensation duct (1124) (Figs. 12 to 15).

[0196] Accordingly, the return duct (114) and the second condensation duct (1124) can be easily manufactured at low cost with a simple configuration.

[0197] Additionally, since the return duct (114) and the second condensation duct (1124) are partitioned by a single dividing wall (W), some of the heat generated by the heater (140) placed inside the return duct (114) can be easily transferred to the second condensation duct (1124). Accordingly, the small amount of water inside the second condensation duct (1124) vaporizes due to the heat transferred to the second condensation duct (1124), thereby lowering the humidity of the second condensation duct (1124) and preventing the proliferation of bacteria or mold inside the second condensation duct (1124).

[0198] Additionally, the separating wall (W) can prevent the heat from the heater (140) placed inside the return duct (114) from being transferred directly to the water collected on the lower surface of the second condensation duct (1124). Therefore, it is possible to prevent the large amount of water collected on the lower surface of the second condensation duct (1124) from vaporizing into water vapor by the heater (140) and increasing the humidity of the air. Accordingly, drying performance can be improved.

[0199] In addition, by forming a through hole (TH, D3) in the separation wall (W), a through hole (TH, D3) communicating with the interior of the return duct (114) and the second condensation duct (1124) can be formed simply and easily.

[0200] A through hole (TH, D3, FIG. 13) may be formed in the return duct (114). Specifically, a through hole (TH, D3) communicating with the interior of the return duct (114) and the second condensation duct (1124) may be formed at a predetermined point or part where the return duct (114) and the second condensation duct (1124) come into contact with each other. For example, the through hole (TH, D3) may be formed by penetrating the aforementioned separation wall (W).

[0201] The through hole (TH, D3) can function as a third drain (D3). Additionally, the through hole (TH, D3) can function as a space for installing a heat conductor (160) to be described later. We will examine the former first. The latter will be described later.

[0202] When a through hole (TH, D3) is formed in the return duct (114), water introduced through the outlet (H2) or water condensed in the return duct (114) can be discharged to the outside of the return duct (114) through the through hole (TH, D3), so the drying performance of the drying device (100) can be improved with a simple configuration.

[0203] Here, the outside of the return duct (114) may be the inside of the second condensation duct (1124) (Fig. 13). Accordingly, water that has flowed into the return duct (114) through the outlet (H2) or water that has condensed in the return duct (114) may be discharged to the outside of the return duct (114) through the through hole (TH, D3) and then flow into the second condensation duct (1124).

[0204] It may be desirable for the through hole (TH, D3) to be temporarily opened depending on the situation to prevent a decrease in energy efficiency or drying efficiency, similar to the second drain (D2) described above.

[0205] However, as shown in the drawing, if the through hole (TH, D3) is formed at the aforementioned predetermined point or part where the return duct (114) and the second condensation duct (1124) come into contact with each other, the through hole (TH, D3) may be kept open at all times.

[0206] Even if the through hole (TH, D3) is always open, the air flowing along the return duct (114) is not discharged to the outside of the drying duct (110) through the through hole (TH, D3) but is discharged to the second condensation duct (1124) of the drying duct (110), so that dry or warm air is not lost to the outside and there is no pressure loss to the outside, so the energy efficiency or drying efficiency may not be significantly reduced.

[0207] That is, if the through hole (TH, D3) is formed at the aforementioned predetermined point or part where the return duct (114) and the second condensation duct (1124) come into contact with each other, there is no need to install a separate configuration for opening and closing the through hole (TH, D3). Accordingly, the configuration of the drying device (100) is simplified, and manufacturing, installation, and maintenance costs can be reduced.

[0208] In addition, when the through hole (TH, D3) is always open, water generated or flowing on the lower surface of the return duct (114) is discharged into the second condensation duct (1124) through the through hole (TH, D3), so water does not accumulate on the lower surface of the return duct (114). Therefore, even if the heater (140) is placed inside the return duct (114), it is possible to prevent the humidity of the air from increasing as a large amount of water is vaporized into steam by the heater (140). Accordingly, drying performance can be improved. In addition, since the aforementioned water level sensor does not need to be provided in the return duct (114) and only needs to be provided in the second condensation duct (1124), manufacturing / management costs can be reduced.

[0209] [Pan]

[0210] A fan (130) may be provided between the downstream end (1124D) of the condensation duct (112) and the downstream end (114D) of the return duct (114). For example, the fan (130) may be placed between the second condensation duct (1124) and the return duct (114).

[0211] Accordingly, the fan (130) can prevent the generation of vortices and facilitate the flow of air downstream of the drying duct (110), where the change in the direction of air flow is large (e.g., between the condensation duct and the return duct). Therefore, since the air flow resistance does not increase, the drying performance of the drying device (100) can be improved.

[0212] The fan (130) can be connected to the second condensation duct (1124) (Fig. 15). For example, the fan (130) can be connected downward to the downstream end (1124D) of the second condensation duct (1124).

[0213] Additionally, the fan (130) can be connected to the return duct (114) (Fig. 15). For example, the fan (130) can be connected laterally to the upstream end (114U) of the return duct (114).

[0214] The fan (130) can be placed at the upper end (1124D) of the second condensation duct (1124) (Fig. 15).

[0215] Accordingly, the motor (136) of the fan (130) can be prevented from entering the condensation duct (112) or coming into contact with water condensed in the condensation duct (112). Therefore, since water entering the motor (136) of the fan (130) can prevent the fan (130) from malfunctioning, the durability and stability of the drying device (100) can be improved.

[0216] The fan (130) can circulate air inside the drying duct (110). Specifically, for example, the fan (130) can draw air from the first condensation duct (1122) into the second condensation duct (1124). Additionally, the fan (130) can draw air from the second condensation duct (1124) into the return duct (114). Additionally, the fan (130) can discharge air from the return duct (114) into the washing space (12S) through the outlet (H2) and the distributor (150) to be described later.

[0217] The fan (130) may be configured to include a fan blade (132), a fan housing (134), and a motor (136).

[0218] The fan blade (132) can be fixedly coupled to the rotation axis (138) and rotated by the motor (136). The fan blade (132) can be accommodated in the fan housing (134).

[0219] The fan housing (134) can be connected to the downstream end (1124D) of the second condensation duct (1124) and the upstream end (114U) of the return duct (114).

[0220] For example, the fan housing (134) may have a through hole formed on its lower surface so as to communicate downward with the downstream end (1124D) of the second condensation duct (1124) (Fig. 15). Additionally, the fan housing (134) may have a through hole formed on its side so as to communicate laterally with the upstream end (114U) of the return duct (114) (Fig. 15).

[0221] The fan housing (134) may be configured to include an upper wall (134T). The upper wall (134T) may be positioned between the fan blade (132) and the motor (136) positioned above the fan blade (132).

[0222] Accordingly, even if the fan blade (132) comes into contact with water that has flowed into the return duct (114) through the outlet (H2), the water in contact with the fan blade (132) may be blocked by the upper wall (134T) and may not come into contact with the motor (136). As a result, it is possible to prevent water from flowing into the motor (136) and causing the fan (130) to malfunction, thereby improving the durability and stability of the drying device (100).

[0223] A hole through which a rotation axis (138) passes can be formed in the upper wall (134T).

[0224] The motor (136) can be coupled to the fan blade (132) via a rotating shaft (138). The motor (136) can rotate the fan blade (132).

[0225] The motor (136) can be positioned on the upper part of the fan blade (132). Additionally, the motor (136) can be positioned on the upper wall (134T).

[0226] The rotation axis (138) of the fan (130) can be extended approximately vertically.

[0227] Accordingly, since the fan (130) can be installed horizontally between the second condensation duct (1124) and the return duct (114), a fan (130) having a sufficiently large size can be installed even if the installation space or installation location is limited. Accordingly, the drying performance of the dishwasher (1) can be improved at a low cost with a simple configuration, and the dishwasher (1) can have a small size and a compact structure. At this time, the fan (130) may be a centrifugal fan. In addition, since the motor (136) can be placed on the upper part of the fan blade (132), water can be prevented from entering the motor (136).

[0228] [heater]

[0229] A heater (140) may be provided between the downstream end (1124D) of the condensation duct (112) and the downstream end (114D) of the return duct (114). For example, the heater (140) may be placed in the return duct (114).

[0230] Accordingly, the heater (140) heats the air downstream of the drying duct (110) near the outlet (H2) (e.g., return duct) and discharges the high-temperature, dry air into the washing space (12S), so that drying performance can be improved at a low cost with a simple configuration.

[0231] The heater (140) may be placed inside the return duct (114) (Figs. 10 to 15). However, it is not limited to this configuration. For example, unlike the drawings, the heater (140) may be placed outside the return duct (114) adjacent to the return duct (114).

[0232] In this way, since the heater (140) is positioned inside the return duct (114), the air inside the return duct (114) near the outlet (H2) can be effectively heated without heat loss, so that the heated air discharged into the washing space (12S) can effectively remove moisture remaining on dishes, etc. inside the washing space (12S). Accordingly, drying performance can be improved at low cost with a simple configuration.

[0233] Additionally, since the heater (140) is positioned inside the return duct (114), the heater (140) is positioned far away from the condensation duct (112) so as not to come into contact with the water condensed in the condensation duct (112), the heat generated by the heater (140) can be prevented from vaporizing the large amount of water collected in the condensation duct (112). Accordingly, the air inside the return duct (114) can be discharged into the washing space (12S) in a high-temperature, dry state, thereby improving drying performance.

[0234] In addition, since the heater (140) is positioned inside the return duct (114), the heat conductor (160) positioned through the through hole (TH, D3) can be easily connected to the heater (140) to transfer heat to the condensation duct (112). This will be described later.

[0235] The heater (140) can heat the air inside the drying duct (110).

[0236] In this way, the drying device (100) is configured to include a drying duct (110), a fan (130), and a heater (140), and the drying duct (110) is positioned outside the tub (12) and includes a condensation duct (112) and a return duct (114), thereby allowing the drying performance to be improved at a low cost with a simple configuration.

[0237] [Distributor]

[0238] The distributor (150) may be configured to include an insert (152) and a lid (154) as shown in FIG. 14.

[0239] The lower end of the insert (152) can be connected to the downstream end (114D) of the return duct (114), and the upper end of the insert (152) can be connected to the lid (374). The insert (152) can be installed by passing through the outlet (H2) formed in the bottom (12B) of the tub (12).

[0240] Through the insertion part (152), heated air from the return duct (114) can be introduced into the inside of the cleaning space (12S).

[0241] The lid (154) can be installed on the top of the insertion part (152) and placed inside the cleaning space (12S).

[0242] The lid (154) can prevent water inside the washing space (12S) from flowing into the insertion part (152) and the return duct (114).

[0243] Additionally, the lid (154) can prevent the air exiting the insertion part (152) from facing upward in the vertical direction when it flows into the washing space (12S). Accordingly, since the above-mentioned i) is satisfied, the dry air flowing into the washing space (12S) through the outlet (H2) can effectively circulate throughout the washing space (12S) until it flows into the drying device (100) through the inlet (H1), thereby improving drying efficiency.

[0244] [Heat conductor]

[0245] The heat conductor (160) can be positioned through the through hole (TH, D3). Accordingly, a portion of the heat conductor (160) may be located inside the second condensation duct (1124), and the remaining portion of the heat conductor (160) may be located inside the return duct (114).

[0246] In this way, the heat conductor (160) can be installed simply and easily through the through hole (TH, D3). That is, the through hole (TH, D3) not only functions as the aforementioned third drain (D3) but can also function as a space through which the heat conductor (160) is installed.

[0247] At this time, the heat conductor (160) is connected to a heater (140) placed inside the return duct (114) and can receive heat from the heater (140). Accordingly, the heat from the heater (140) can be transferred to the interior of the second condensation duct (1124).

[0248] Accordingly, the heat conductor (160) can easily supply heat to the interior of the second condensation duct (1124) at low cost with a simple configuration. In addition, since the heat conductor (160) is installed by passing through the through hole (TH, D3), the heat conductor (160) can be easily installed. In addition, since the heat conductor (160) is positioned by passing through the through hole (TH, D3), the heat conductor (160) is not exposed outside the duct (1124, 114), and the length of the heat conductor (160) can be minimized, thereby reducing heat loss and improving heat transfer efficiency.

[0249] In addition, the drying duct (110) has a bent shape to improve drying performance or to manufacture a small and compact structure, and thus, even if the heat from the heater (140) placed inside the return duct (114) is not well transferred to the inside of the second condensation duct (1124), the heat conductor (160) can supply heat to the inside of the second condensation duct (1124). Therefore, the heat conductor (160) can lower the humidity inside the second condensation duct (1124) to prevent the proliferation of bacteria or mold, or to remove bacteria or mold and to remove odors.

[0250] The heat conductor (160) can be made of a metal material with high thermal conductivity, for example.

[0251] A heat conductor (160) may be placed near a water accumulation space (P, FIG. 13) formed inside the second condensation duct (1124). A second drain (D2) may be formed at the bottom of the water accumulation space (P) of the second condensation duct (1124).

[0252] Accordingly, heat is supplied near the water accumulation space (P) with high humidity in the second condensation duct (1124), so humidity can be effectively lowered. Accordingly, the number or size of the heat conductor (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Therefore, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or bacteria or mold can be effectively removed. In addition, odors can be effectively removed.

[0253] Additionally, the heat conductor (160) may be positioned near the upstream end (1124BU) of the second downstream duct (1124B). Accordingly, heat supplied from the heat conductor (160) is transferred (convected) throughout the second downstream duct (1124B) by air flowing from the upstream end (1124BU) to the downstream end (1124BD) of the second downstream duct (1124B), thereby effectively lowering the humidity of the second condensation duct (1124). Consequently, the number or size of the heat conductors (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Therefore, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or effectively removed. Furthermore, odors can be effectively removed.

[0254] In particular, as described above, the slope of the second downstream duct (1124B) may be smaller than the slope of the second upstream duct (1124A) or the first condensation duct (1122), and since the second downstream duct (1124B) may be located at the lowest height, the most water may accumulate in the second downstream duct (1124B) and the humidity may be the highest. Accordingly, if a heat conductor (160) is placed near the upstream end (1124BU) of the second downstream duct (1124B) to lower the humidity of the entire second downstream duct (1124B), bacteria or mold in the drying duct (110) can be effectively reduced or removed.

[0255] In addition, as described above, if the lower surface of the second downstream duct (1124B) is formed such that its height gradually increases from near the upstream end (1124BU) of the second downstream duct (1124B) to near the downstream end (1124BD), a water accumulation space (P) is formed near the upstream end (1124BU) of the second downstream duct (1124B). Accordingly, when a heat conductor (160) is placed near the upstream end (1124BU) of the second downstream duct (1124B), as described above, heat is supplied near the water accumulation space (P) with high humidity, and the heat supplied from the heat conductor (160) is transferred (convected) throughout the second downstream duct (1124B) by the air flowing from the upstream end (1124BU) to the downstream end (1124BD) of the second downstream duct (1124B), thereby allowing the humidity of the second condensation duct (1124) to be lowered more effectively. Accordingly, the number or size of the heat conductors (160) can be reduced, and the humidity of the second condensation duct (1124) can be effectively lowered with a small amount of heat. Therefore, manufacturing / management costs and energy consumption can be reduced, and the proliferation of bacteria or mold can be effectively prevented or bacteria or mold can be effectively removed. In addition, it can effectively remove bad odors.

[0256] The heat conductor (160) may be configured to include a plurality (e.g., two) heat-conducting members (162) spaced apart from each other (Figs. 10, 11 and 14).

[0257] Accordingly, the surface area of ​​the heat conductor (160) is increased so that heat can be effectively transferred into the interior of the second condensation duct (1124) and air can flow through the space between the heat conductors (162), thereby preventing an increase in air flow resistance caused by the heat conductor (160).

[0258] Meanwhile, it may be desirable to make the amount of heat supplied from the heat conductor (160) smaller than the amount of heat from the heater (360) so that the heat conductor (160) evaporates a small amount of moisture and lowers the humidity of the second condensation duct (1124). If the amount of heat supplied from the heat conductor (160) increases, a large amount of water accumulated in the water accumulation space (P) inside the second condensation duct (1124) evaporates, and the humidity of the air discharged into the washing space (12S) may increase, so the drying performance of the drying device (100) may decrease.

[0259] FIG. 16 is a cross-sectional view showing a second downstream duct, a return duct, a fan housing, a heater, and a heat conductor according to another embodiment of the present invention.

[0260] Referring to FIG. 16, the heat conductor (160) may be positioned through the aforementioned through hole (TH). At this time, the through hole (TH) may have a cross-sectional area of ​​the same size as the portion of the heat conductor (160) located through the through hole (TH).

[0261] For example, the through hole (TH) can be formed with a shape and size corresponding to the cross-section of the portion of the heat conductor (160) that passes through the through hole (TH). Accordingly, the inner surface of the through hole (TH) can come into contact with the heat conductor (160).

[0262] Accordingly, since the through hole (TH) is blocked by the heat conductor (160), the backflow or circulation of air flowing from the second condensation duct (1124) to the return duct (114) through the through hole (TH) back to the second condensation duct (1124) can be prevented, and the turbulence caused by this can also be prevented. Therefore, energy efficiency or drying efficiency can be improved.

[0263] [Control Unit]

[0264] The dishwasher (1) may further include a control unit (200, FIG. 1).

[0265] The control unit (200) may receive information regarding the water level from a water level sensor (not shown). If the value included in the information regarding the water level is above a threshold value, the control unit (200) may warn the user, stop the operation of the drying device (100), or temporarily open the second drain (D2) to discharge the water.

[0266] Accordingly, water can be prevented from entering the motor (136) of the fan (130), thereby improving the durability and stability of the drying device (100).

[0267] Meanwhile, the second downstream duct (1124B), fan housing (134), and return duct (114) of FIGS. 11 to 13 may be configured to include a first housing (C1), a second housing (C2), a third housing (C3), and a fourth housing (C4), as shown in FIG. 14.

[0268] The first housing (C1) is positioned at the bottom and can be opened upward.

[0269] The second housing (C2) is positioned on top of the first housing (C1) and can be combined with the first housing (C1).

[0270] The third housing (C3) is open downward and positioned on the upper part of the second housing (C2), and can be combined with the second housing (C2).

[0271] The fourth housing (C4) is positioned on the upper part of one end of the second housing (C2) and can be combined with the second housing (C2).

[0272] The second downstream duct (1124B) may be defined by the first housing (C1) and the second housing (C2), and the return duct (114) may be defined by the second housing (C2) and the third housing (C3). The aforementioned partition wall (W) may be the bottom of the second housing (C2).

[0273] The fan housing (134) may be defined by one end of the second housing (C2) and the fourth housing (C4). That is, a part of the fan housing (134) (one end of the second housing) may be formed integrally with a part of the return duct (114) (the remaining part of the second housing). The fourth housing (C4) may be the upper wall (134T) of the aforementioned fan housing (134).

[0274] The aforementioned second drain (D2) may be formed on the bottom of the first housing (C1), and the aforementioned third drain (D3) may be formed on the bottom of the second housing (C2).

[0275] The heater (140) can be placed in the inner space formed by combining the second housing (C2) and the third housing (C3). At this time, a fixing part (142) having high heat resistance and low thermal conductivity can be fixed to the second housing (C2) or the third housing (C3), and the heater (140) can be installed by connecting it to the fixing part (142). Accordingly, the second housing (C2) or the third housing (C3) can be prevented from being damaged by the heater (140).

[0276] The heat conductor (160) can be combined with the heater (140) and can be positioned through the bottom of the second housing (C2).

[0277] In this way, the second downstream duct (1124B), the fan housing (134), and the return duct (114) are combined with the first housing (C1), the second housing (C2), the third housing (C3), and the fourth housing (C4), so that the drying device (100) can be manufactured simply and easily, maintenance can be easy, and the drying device (100) can have a small size and a compact structure.

[0278] Meanwhile, for convenience, the drying duct (110) is described as being composed of a condensation duct (112) and a return duct (114), but the condensation duct (112) and the return duct (114) can be formed as a single unit.

[0279] The first condensation duct (1122) and the second condensation duct (1124) can also be formed as a single unit.

[0280] The above ducts (110, 112, 1122, 1124, 114) may be made of a metal material such as aluminum or stainless steel.

[0281] The above ducts (110, 112, 1122, 1124, 114) can be manufactured by sheet metal forming or injection molding.

[0282] A part of the drying device (100), such as the fan (130), can be formed of plastic.

[0283] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration of the present invention were not explicitly described while explaining the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized. Explanation of the symbols

[0284] 1: Dishwasher 12: Tub 100: Drying device 110: Drying duct 112: Condensation duct 1122: 1st Condensation Duct 1122A: 1st Upstream Duct 1122B: Heat exchange duct 1122C: First downstream duct 1123: 2nd connecting duct 1124: 2nd condensation duct 1124A: 2nd upstream duct 1124B: 2nd downstream duct 114: Return duct 120: Cold air supply module 122: First outside air inlet duct 123: 1st connecting duct 124: 2nd outside air inlet duct 126: Heat exchange channel 1262: Plate 1264: Partition wall 128: Cooling fan 130: Fan 132: Fan blade 134: Fan housing 136: Motor 138: Rotation axis 140: Heater 150: Distributor 160: Thermal conductor 162: Thermal conductive member

Claims

Claim 1 A tub comprising a bottom, an upper wall, a one-sided wall, a other-sided wall, and a rear wall, wherein a washing space is formed inside; a door provided at the front of the tub for opening and closing the washing space; and a drying device for drying the washing space, wherein the tub has an inlet and an outlet located below the inlet, and the drying device includes a drying duct that is in communication with the inlet and outlet and is positioned on the outside of the tub, and includes a condensation duct and a return duct; a fan for circulating air inside the drying duct; and a heater located inside the drying duct for heating the air, wherein the condensation duct includes a first condensation duct facing the outer surface of the one-sided wall and having an upstream end in communication with the inlet. A dishwasher comprising a second condensation duct positioned at the bottom of the above-mentioned floor and having an upstream end communicating with a downstream end of the first condensation duct, wherein the return duct is positioned between the bottom of the tub and the second condensation duct, with an upstream end communicating with a downstream end of the second condensation duct and a downstream end communicating with the outlet, wherein the return duct and the second condensation duct are in contact with each other vertically at a predetermined point between the upstream and downstream ends of the return duct and the second condensation duct, and a through hole is formed at the predetermined point communicating with the interior of the return duct and the second condensation duct. Claim 2 A dishwasher according to claim 1, wherein a single partition wall partitioning the return duct and the second condensation duct is disposed at the predetermined point, and the through hole is formed in the partition wall. Claim 3 A dishwasher according to claim 1, wherein the heater is disposed inside the return duct. Claim 4 A dishwasher according to claim 3, wherein the drying device comprises a heat conductor disposed through the through hole and connected to the heater to receive heat from the heater. Claim 5 A dishwasher according to claim 4, wherein the heat conductor is located near a water retention space formed inside the second condensation duct. Claim 6 A dishwasher according to claim 4, wherein the second condensation duct comprises a downstream duct that is in communication with the upstream end of the return duct and is formed parallel to a horizontal plane or inclined upward along the direction of air flow, and the heat conductor is positioned near the upstream end of the downstream duct. Claim 7 A dishwasher according to claim 6, wherein the lower surface of the downstream duct gradually increases in height from near the upstream end of the downstream duct to near the downstream end. Claim 8 A dishwasher according to claim 4, wherein the heat conductor comprises a plurality of heat-conducting members spaced apart from each other. Claim 9 A dishwasher according to claim 4, wherein the through hole has a cross-sectional area of ​​the same size as the portion of the heat conductor located through the through hole.

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